2 * Unix networking abstraction.
11 #include <sys/types.h>
12 #include <sys/socket.h>
13 #include <sys/ioctl.h>
14 #include <arpa/inet.h>
15 #include <netinet/in.h>
16 #include <netinet/tcp.h>
20 #define DEFINE_PLUG_METHOD_MACROS
26 # define X11_UNIX_PATH "/tmp/.X11-unix/X"
29 #define ipv4_is_loopback(addr) (inet_netof(addr) == IN_LOOPBACKNET)
32 struct socket_function_table
*fn
;
33 /* the above variable absolutely *must* be the first in this structure */
41 int frozen
; /* this causes readability notifications to be ignored */
42 int frozen_readable
; /* this means we missed at least one readability
43 * notification while we were frozen */
44 int localhost_only
; /* for listening sockets */
47 int oobpending
; /* is there OOB data available to read? */
49 int pending_error
; /* in case send() returns error */
54 * We used to typedef struct Socket_tag *Socket.
56 * Since we have made the networking abstraction slightly more
57 * abstract, Socket no longer means a tcp socket (it could mean
58 * an ssl socket). So now we must use Actual_Socket when we know
59 * we are talking about a tcp socket.
61 typedef struct Socket_tag
*Actual_Socket
;
66 * Which address family this address belongs to. AF_INET for
67 * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name
68 * resolution has not been done and a simple host name is held
69 * in this SockAddr structure.
73 struct addrinfo
*ai
; /* Address IPv6 style. */
75 unsigned long address
; /* Address IPv4 style. */
77 char hostname
[512]; /* Store an unresolved host name. */
80 static tree234
*sktree
;
82 static void uxsel_tell(Actual_Socket s
);
84 static int cmpfortree(void *av
, void *bv
)
86 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
87 int as
= a
->s
, bs
= b
->s
;
95 static int cmpforsearch(void *av
, void *bv
)
97 Actual_Socket b
= (Actual_Socket
) bv
;
98 int as
= *(int *)av
, bs
= b
->s
;
108 sktree
= newtree234(cmpfortree
);
111 void sk_cleanup(void)
117 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
123 const char *error_string(int error
)
125 return strerror(error
);
128 SockAddr
sk_namelookup(const char *host
, char **canonicalname
, int address_family
)
130 SockAddr ret
= snew(struct SockAddr_tag
);
132 struct addrinfo hints
;
136 struct hostent
*h
= NULL
;
140 /* Clear the structure and default to IPv4. */
141 memset(ret
, 0, sizeof(struct SockAddr_tag
));
142 ret
->family
= 0; /* We set this one when we have resolved the host. */
147 hints
.ai_flags
= AI_CANONNAME
;
148 hints
.ai_family
= address_family
;
149 hints
.ai_socktype
= 0;
150 hints
.ai_protocol
= 0;
151 hints
.ai_addrlen
= 0;
152 hints
.ai_addr
= NULL
;
153 hints
.ai_canonname
= NULL
;
154 hints
.ai_next
= NULL
;
155 err
= getaddrinfo(host
, NULL
, NULL
, &ret
->ai
);
157 ret
->error
= gai_strerror(err
);
160 ret
->family
= ret
->ai
->ai_family
;
162 if (ret
->ai
->ai_canonname
!= NULL
)
163 strncat(realhost
, ret
->ai
->ai_canonname
, sizeof(realhost
) - 1);
165 strncat(realhost
, host
, sizeof(realhost
) - 1);
167 if ((a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
169 * Otherwise use the IPv4-only gethostbyname... (NOTE:
170 * we don't use gethostbyname as a fallback!)
172 if (ret
->family
== 0) {
173 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
174 if ( (h
= gethostbyname(host
)) )
175 ret
->family
= AF_INET
;
177 if (ret
->family
== 0) {
178 ret
->error
= (h_errno
== HOST_NOT_FOUND
||
179 h_errno
== NO_DATA
||
180 h_errno
== NO_ADDRESS ?
"Host does not exist" :
181 h_errno
== TRY_AGAIN ?
182 "Temporary name service failure" :
183 "gethostbyname: unknown error");
186 memcpy(&a
, h
->h_addr
, sizeof(a
));
187 /* This way we are always sure the h->h_name is valid :) */
188 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
191 * This must be a numeric IPv4 address because it caused a
192 * success return from inet_addr.
194 ret
->family
= AF_INET
;
195 strncpy(realhost
, host
, sizeof(realhost
));
197 ret
->address
= ntohl(a
);
199 realhost
[lenof(realhost
)-1] = '\0';
200 *canonicalname
= snewn(1+strlen(realhost
), char);
201 strcpy(*canonicalname
, realhost
);
205 SockAddr
sk_nonamelookup(const char *host
)
207 SockAddr ret
= snew(struct SockAddr_tag
);
209 ret
->family
= AF_UNSPEC
;
210 strncpy(ret
->hostname
, host
, lenof(ret
->hostname
));
211 ret
->hostname
[lenof(ret
->hostname
)-1] = '\0';
215 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
218 if (addr
->family
== AF_UNSPEC
) {
219 strncpy(buf
, addr
->hostname
, buflen
);
220 buf
[buflen
-1] = '\0';
223 if (getnameinfo(addr
->ai
->ai_addr
, addr
->ai
->ai_addrlen
, buf
, buflen
,
224 NULL
, 0, NI_NUMERICHOST
) != 0) {
226 strncat(buf
, "<unknown>", buflen
- 1);
230 assert(addr
->family
== AF_INET
);
231 a
.s_addr
= htonl(addr
->address
);
232 strncpy(buf
, inet_ntoa(a
), buflen
);
233 buf
[buflen
-1] = '\0';
238 int sk_hostname_is_local(char *name
)
240 return !strcmp(name
, "localhost");
243 int sk_address_is_local(SockAddr addr
)
246 if (addr
->family
== AF_UNSPEC
)
247 return 0; /* we don't know; assume not */
250 if (addr
->family
== AF_INET
)
251 return ipv4_is_loopback(
252 ((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_addr
);
253 else if (addr
->family
== AF_INET6
)
254 return IN6_IS_ADDR_LOOPBACK(
255 &((struct sockaddr_in6
*)addr
->ai
->ai_addr
)->sin6_addr
);
260 assert(addr
->family
== AF_INET
);
261 a
.s_addr
= htonl(addr
->address
);
262 return ipv4_is_loopback(a
);
267 int sk_addrtype(SockAddr addr
)
269 return (addr
->family
== AF_INET ? ADDRTYPE_IPV4
:
271 addr
->family
== AF_INET6 ? ADDRTYPE_IPV6
:
276 void sk_addrcopy(SockAddr addr
, char *buf
)
280 if (addr
->family
== AF_INET
)
281 memcpy(buf
, &((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_addr
,
282 sizeof(struct in_addr
));
283 else if (addr
->family
== AF_INET6
)
284 memcpy(buf
, &((struct sockaddr_in6
*)addr
->ai
->ai_addr
)->sin6_addr
,
285 sizeof(struct in6_addr
));
291 assert(addr
->family
== AF_INET
);
292 a
.s_addr
= htonl(addr
->address
);
293 memcpy(buf
, (char*) &a
.s_addr
, 4);
297 void sk_addr_free(SockAddr addr
)
301 if (addr
->ai
!= NULL
)
302 freeaddrinfo(addr
->ai
);
307 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
309 Actual_Socket s
= (Actual_Socket
) sock
;
316 static void sk_tcp_flush(Socket s
)
319 * We send data to the socket as soon as we can anyway,
320 * so we don't need to do anything here. :-)
324 static void sk_tcp_close(Socket s
);
325 static int sk_tcp_write(Socket s
, const char *data
, int len
);
326 static int sk_tcp_write_oob(Socket s
, const char *data
, int len
);
327 static void sk_tcp_set_private_ptr(Socket s
, void *ptr
);
328 static void *sk_tcp_get_private_ptr(Socket s
);
329 static void sk_tcp_set_frozen(Socket s
, int is_frozen
);
330 static const char *sk_tcp_socket_error(Socket s
);
332 static struct socket_function_table tcp_fn_table
= {
338 sk_tcp_set_private_ptr
,
339 sk_tcp_get_private_ptr
,
344 Socket
sk_register(OSSocket sockfd
, Plug plug
)
349 * Create Socket structure.
351 ret
= snew(struct Socket_tag
);
352 ret
->fn
= &tcp_fn_table
;
355 bufchain_init(&ret
->output_data
);
356 ret
->writable
= 1; /* to start with */
357 ret
->sending_oob
= 0;
359 ret
->frozen_readable
= 0;
360 ret
->localhost_only
= 0; /* unused, but best init anyway */
361 ret
->pending_error
= 0;
362 ret
->oobpending
= FALSE
;
368 ret
->error
= error_string(errno
);
380 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
381 int nodelay
, int keepalive
, Plug plug
)
385 struct sockaddr_in6 a6
;
387 struct sockaddr_in a
;
388 struct sockaddr_un au
;
389 const struct sockaddr
*sa
;
396 * Create Socket structure.
398 ret
= snew(struct Socket_tag
);
399 ret
->fn
= &tcp_fn_table
;
402 bufchain_init(&ret
->output_data
);
403 ret
->connected
= 0; /* to start with */
404 ret
->writable
= 0; /* to start with */
405 ret
->sending_oob
= 0;
407 ret
->frozen_readable
= 0;
408 ret
->localhost_only
= 0; /* unused, but best init anyway */
409 ret
->pending_error
= 0;
410 ret
->oobpending
= FALSE
;
416 assert(addr
->family
!= AF_UNSPEC
);
417 s
= socket(addr
->family
, SOCK_STREAM
, 0);
421 ret
->error
= error_string(errno
);
425 ret
->oobinline
= oobinline
;
428 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
433 setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
438 setsockopt(s
, SOL_SOCKET
, SO_KEEPALIVE
, (void *) &b
, sizeof(b
));
442 * Bind to local address.
445 localport
= 1023; /* count from 1023 downwards */
447 localport
= 0; /* just use port 0 (ie kernel picks) */
449 /* BSD IP stacks need sockaddr_in zeroed before filling in */
450 memset(&a
,'\0',sizeof(struct sockaddr_in
));
452 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
455 /* We don't try to bind to a local address for UNIX domain sockets. (Why
456 * do we bother doing the bind when localport == 0 anyway?) */
457 if(addr
->family
!= AF_UNIX
) {
458 /* Loop round trying to bind */
463 if (addr
->family
== AF_INET6
) {
464 /* XXX use getaddrinfo to get a local address? */
465 a6
.sin6_family
= AF_INET6
;
466 a6
.sin6_addr
= in6addr_any
;
467 a6
.sin6_port
= htons(localport
);
468 retcode
= bind(s
, (struct sockaddr
*) &a6
, sizeof(a6
));
472 assert(addr
->family
== AF_INET
);
473 a
.sin_family
= AF_INET
;
474 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
475 a
.sin_port
= htons(localport
);
476 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
483 if (err
!= EADDRINUSE
) /* failed, for a bad reason */
488 break; /* we're only looping once */
491 break; /* we might have got to the end */
495 ret
->error
= error_string(err
);
501 * Connect to remote address.
503 switch(addr
->family
) {
506 /* XXX would be better to have got getaddrinfo() to fill in the port. */
507 ((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_port
=
509 sa
= (const struct sockaddr
*)addr
->ai
->ai_addr
;
510 salen
= addr
->ai
->ai_addrlen
;
513 ((struct sockaddr_in
*)addr
->ai
->ai_addr
)->sin_port
=
515 sa
= (const struct sockaddr
*)addr
->ai
->ai_addr
;
516 salen
= addr
->ai
->ai_addrlen
;
520 a
.sin_family
= AF_INET
;
521 a
.sin_addr
.s_addr
= htonl(addr
->address
);
522 a
.sin_port
= htons((short) port
);
523 sa
= (const struct sockaddr
*)&a
;
528 assert(port
== 0); /* to catch confused people */
529 assert(strlen(addr
->hostname
) < sizeof au
.sun_path
);
530 memset(&au
, 0, sizeof au
);
531 au
.sun_family
= AF_UNIX
;
532 strcpy(au
.sun_path
, addr
->hostname
);
533 sa
= (const struct sockaddr
*)&au
;
538 assert(0 && "unknown address family");
541 fl
= fcntl(s
, F_GETFL
);
543 fcntl(s
, F_SETFL
, fl
| O_NONBLOCK
);
545 if ((connect(s
, sa
, salen
)) < 0) {
546 if ( errno
!= EINPROGRESS
) {
547 ret
->error
= error_string(errno
);
552 * If we _don't_ get EWOULDBLOCK, the connect has completed
553 * and we should set the socket as connected and writable.
567 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
, int address_family
)
571 struct addrinfo hints
, *ai
;
574 struct sockaddr_in a
;
581 * Create Socket structure.
583 ret
= snew(struct Socket_tag
);
584 ret
->fn
= &tcp_fn_table
;
587 bufchain_init(&ret
->output_data
);
588 ret
->writable
= 0; /* to start with */
589 ret
->sending_oob
= 0;
591 ret
->frozen_readable
= 0;
592 ret
->localhost_only
= local_host_only
;
593 ret
->pending_error
= 0;
594 ret
->oobpending
= FALSE
;
598 * Translate address_family from platform-independent constants
599 * into local reality.
601 address_family
= (address_family
== ADDRTYPE_IPV4 ? AF_INET
:
602 address_family
== ADDRTYPE_IPV6 ? AF_INET6
: AF_UNSPEC
);
605 /* Let's default to IPv6.
606 * If the stack doesn't support IPv6, we will fall back to IPv4. */
607 if (address_family
== AF_UNSPEC
) address_family
= AF_INET6
;
609 /* No other choice, default to IPv4 */
610 if (address_family
== AF_UNSPEC
) address_family
= AF_INET
;
616 s
= socket(address_family
, SOCK_STREAM
, 0);
618 /* If the host doesn't support IPv6 try fallback to IPv4. */
619 if (s
< 0 && address_family
== AF_INET6
) {
620 address_family
= AF_INET
;
621 s
= socket(address_family
, SOCK_STREAM
, 0);
626 ret
->error
= error_string(errno
);
632 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
634 /* BSD IP stacks need sockaddr_in zeroed before filling in */
635 memset(&a
,'\0',sizeof(struct sockaddr_in
));
638 memset(&a6
,'\0',sizeof(struct sockaddr_in6
));
640 hints
.ai_flags
= AI_NUMERICHOST
;
641 hints
.ai_family
= address_family
;
642 hints
.ai_socktype
= 0;
643 hints
.ai_protocol
= 0;
644 hints
.ai_addrlen
= 0;
645 hints
.ai_addr
= NULL
;
646 hints
.ai_canonname
= NULL
;
647 hints
.ai_next
= NULL
;
648 sprintf(portstr
, "%d", port
);
649 if (srcaddr
!= NULL
&& getaddrinfo(srcaddr
, portstr
, &hints
, &ai
) == 0)
650 retcode
= bind(s
, ai
->ai_addr
, ai
->ai_addrlen
);
655 * FIXME: Need two listening sockets, in principle, one for v4
659 a6
.sin6_addr
= in6addr_loopback
;
661 a6
.sin6_addr
= in6addr_any
;
662 a6
.sin6_port
= htons(port
);
668 a
.sin_family
= AF_INET
;
671 * Bind to source address. First try an explicitly
675 a
.sin_addr
.s_addr
= inet_addr(srcaddr
);
676 if (a
.sin_addr
.s_addr
!= INADDR_NONE
) {
677 /* Override localhost_only with specified listen addr. */
678 ret
->localhost_only
= ipv4_is_loopback(a
.sin_addr
);
684 * ... and failing that, go with one of the standard ones.
688 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
690 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
693 a
.sin_port
= htons((short)port
);
694 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
704 ret
->error
= error_string(err
);
709 if (listen(s
, SOMAXCONN
) < 0) {
711 ret
->error
= error_string(errno
);
721 static void sk_tcp_close(Socket sock
)
723 Actual_Socket s
= (Actual_Socket
) sock
;
731 int sk_getxdmdata(void *sock
, unsigned long *ip
, int *port
)
733 Actual_Socket s
= (Actual_Socket
) sock
;
734 struct sockaddr_in addr
;
738 * We must check that this socket really _is_ an Actual_Socket.
740 if (s
->fn
!= &tcp_fn_table
)
741 return 0; /* failure */
743 addrlen
= sizeof(addr
);
744 if (getsockname(s
->s
, (struct sockaddr
*)&addr
, &addrlen
) < 0)
746 switch(addr
.sin_family
) {
748 *ip
= ntohl(addr
.sin_addr
.s_addr
);
749 *port
= ntohs(addr
.sin_port
);
753 * For a Unix socket, we return 0xFFFFFFFF for the IP address and
754 * our current pid for the port. Bizarre, but such is life.
756 *ip
= ntohl(0xFFFFFFFF);
770 * The function which tries to send on a socket once it's deemed
773 void try_send(Actual_Socket s
)
775 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
781 if (s
->sending_oob
) {
782 urgentflag
= MSG_OOB
;
783 len
= s
->sending_oob
;
787 bufchain_prefix(&s
->output_data
, &data
, &len
);
789 nsent
= send(s
->s
, data
, len
, urgentflag
);
790 noise_ultralight(nsent
);
792 err
= (nsent
< 0 ? errno
: 0);
793 if (err
== EWOULDBLOCK
) {
795 * Perfectly normal: we've sent all we can for the moment.
799 } else if (nsent
== 0 ||
800 err
== ECONNABORTED
|| err
== ECONNRESET
) {
802 * If send() returns CONNABORTED or CONNRESET, we
803 * unfortunately can't just call plug_closing(),
804 * because it's quite likely that we're currently
805 * _in_ a call from the code we'd be calling back
806 * to, so we'd have to make half the SSH code
807 * reentrant. Instead we flag a pending error on
808 * the socket, to be dealt with (by calling
809 * plug_closing()) at some suitable future moment.
811 s
->pending_error
= err
;
814 /* We're inside the Unix frontend here, so we know
815 * that the frontend handle is unnecessary. */
816 logevent(NULL
, error_string(err
));
817 fatalbox("%s", error_string(err
));
820 if (s
->sending_oob
) {
822 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
823 s
->sending_oob
= len
- nsent
;
828 bufchain_consume(&s
->output_data
, nsent
);
835 static int sk_tcp_write(Socket sock
, const char *buf
, int len
)
837 Actual_Socket s
= (Actual_Socket
) sock
;
840 * Add the data to the buffer list on the socket.
842 bufchain_add(&s
->output_data
, buf
, len
);
845 * Now try sending from the start of the buffer list.
851 * Update the select() status to correctly reflect whether or
852 * not we should be selecting for write.
856 return bufchain_size(&s
->output_data
);
859 static int sk_tcp_write_oob(Socket sock
, const char *buf
, int len
)
861 Actual_Socket s
= (Actual_Socket
) sock
;
864 * Replace the buffer list on the socket with the data.
866 bufchain_clear(&s
->output_data
);
867 assert(len
<= sizeof(s
->oobdata
));
868 memcpy(s
->oobdata
, buf
, len
);
869 s
->sending_oob
= len
;
872 * Now try sending from the start of the buffer list.
878 * Update the select() status to correctly reflect whether or
879 * not we should be selecting for write.
883 return s
->sending_oob
;
886 static int net_select_result(int fd
, int event
)
890 char buf
[20480]; /* nice big buffer for plenty of speed */
894 /* Find the Socket structure */
895 s
= find234(sktree
, &fd
, cmpforsearch
);
897 return 1; /* boggle */
899 noise_ultralight(event
);
902 case 4: /* exceptional */
905 * On a non-oobinline socket, this indicates that we
906 * can immediately perform an OOB read and get back OOB
907 * data, which we will send to the back end with
908 * type==2 (urgent data).
910 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
911 noise_ultralight(ret
);
913 const char *str
= (ret
== 0 ?
"Internal networking trouble" :
914 error_string(errno
));
915 /* We're inside the Unix frontend here, so we know
916 * that the frontend handle is unnecessary. */
920 return plug_receive(s
->plug
, 2, buf
, ret
);
926 * If we reach here, this is an oobinline socket, which
927 * means we should set s->oobpending and then deal with it
928 * when we get called for the readability event (which
929 * should also occur).
931 s
->oobpending
= TRUE
;
933 case 1: /* readable; also acceptance */
936 * On a listening socket, the readability event means a
937 * connection is ready to be accepted.
939 struct sockaddr_in isa
;
940 int addrlen
= sizeof(struct sockaddr_in
);
941 int t
; /* socket of connection */
943 memset(&isa
, 0, sizeof(struct sockaddr_in
));
945 t
= accept(s
->s
,(struct sockaddr
*)&isa
,(socklen_t
*) &addrlen
);
950 if (s
->localhost_only
&& !ipv4_is_loopback(isa
.sin_addr
)) {
951 close(t
); /* someone let nonlocal through?! */
952 } else if (plug_accepting(s
->plug
, t
)) {
953 close(t
); /* denied or error */
959 * If we reach here, this is not a listening socket, so
960 * readability really means readability.
963 /* In the case the socket is still frozen, we don't even bother */
965 s
->frozen_readable
= 1;
970 * We have received data on the socket. For an oobinline
971 * socket, this might be data _before_ an urgent pointer,
972 * in which case we send it to the back end with type==1
973 * (data prior to urgent).
975 if (s
->oobinline
&& s
->oobpending
) {
977 if (ioctl(s
->s
, SIOCATMARK
, &atmark
) == 0 && atmark
)
978 s
->oobpending
= FALSE
; /* clear this indicator */
982 ret
= recv(s
->s
, buf
, s
->oobpending ?
1 : sizeof(buf
), 0);
983 noise_ultralight(ret
);
985 if (errno
== EWOULDBLOCK
) {
990 return plug_closing(s
->plug
, error_string(errno
), errno
, 0);
991 } else if (0 == ret
) {
992 return plug_closing(s
->plug
, NULL
, 0, 0);
994 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
997 case 2: /* writable */
1000 * select() reports a socket as _writable_ when an
1001 * asynchronous connection is completed.
1003 s
->connected
= s
->writable
= 1;
1007 int bufsize_before
, bufsize_after
;
1009 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1011 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1012 if (bufsize_after
< bufsize_before
)
1013 plug_sent(s
->plug
, bufsize_after
);
1022 * Deal with socket errors detected in try_send().
1024 void net_pending_errors(void)
1030 * This might be a fiddly business, because it's just possible
1031 * that handling a pending error on one socket might cause
1032 * others to be closed. (I can't think of any reason this might
1033 * happen in current SSH implementation, but to maintain
1034 * generality of this network layer I'll assume the worst.)
1036 * So what we'll do is search the socket list for _one_ socket
1037 * with a pending error, and then handle it, and then search
1038 * the list again _from the beginning_. Repeat until we make a
1039 * pass with no socket errors present. That way we are
1040 * protected against the socket list changing under our feet.
1044 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1045 if (s
->pending_error
) {
1047 * An error has occurred on this socket. Pass it to the
1050 plug_closing(s
->plug
, error_string(s
->pending_error
),
1051 s
->pending_error
, 0);
1059 * Each socket abstraction contains a `void *' private field in
1060 * which the client can keep state.
1062 static void sk_tcp_set_private_ptr(Socket sock
, void *ptr
)
1064 Actual_Socket s
= (Actual_Socket
) sock
;
1065 s
->private_ptr
= ptr
;
1068 static void *sk_tcp_get_private_ptr(Socket sock
)
1070 Actual_Socket s
= (Actual_Socket
) sock
;
1071 return s
->private_ptr
;
1075 * Special error values are returned from sk_namelookup and sk_new
1076 * if there's a problem. These functions extract an error message,
1077 * or return NULL if there's no problem.
1079 const char *sk_addr_error(SockAddr addr
)
1083 static const char *sk_tcp_socket_error(Socket sock
)
1085 Actual_Socket s
= (Actual_Socket
) sock
;
1089 static void sk_tcp_set_frozen(Socket sock
, int is_frozen
)
1091 Actual_Socket s
= (Actual_Socket
) sock
;
1092 if (s
->frozen
== is_frozen
)
1094 s
->frozen
= is_frozen
;
1095 if (!is_frozen
&& s
->frozen_readable
) {
1097 recv(s
->s
, &c
, 1, MSG_PEEK
);
1099 s
->frozen_readable
= 0;
1103 static void uxsel_tell(Actual_Socket s
)
1107 rwx
|= 2; /* write == connect */
1108 if (s
->connected
&& !s
->frozen
)
1109 rwx
|= 1 | 4; /* read, except */
1110 if (bufchain_size(&s
->output_data
))
1111 rwx
|= 2; /* write */
1113 rwx
|= 1; /* read == accept */
1114 uxsel_set(s
->s
, rwx
, net_select_result
);
1117 int net_service_lookup(char *service
)
1120 se
= getservbyname(service
, NULL
);
1122 return ntohs(se
->s_port
);
1127 SockAddr
platform_get_x11_unix_address(int displaynum
, char **canonicalname
)
1129 SockAddr ret
= snew(struct SockAddr_tag
);
1132 memset(ret
, 0, sizeof *ret
);
1133 ret
->family
= AF_UNIX
;
1134 n
= snprintf(ret
->hostname
, sizeof ret
->hostname
,
1135 "%s%d", X11_UNIX_PATH
, displaynum
);
1137 ret
->error
= "snprintf failed";
1138 else if(n
>= sizeof ret
->hostname
)
1139 ret
->error
= "X11 UNIX name too long";
1141 *canonicalname
= dupstr(ret
->hostname
);